WO2016169012A1

WO2016169012A1 - Power supply method and system for hydrostatic test on primary circuit of nuclear power plant

Info

Publication number: WO2016169012A1
Application number: PCT/CN2015/077232
Authority: WO
Inventors: 周创彬; 余维铭; 张颢; 陈军; 张在盛; 杨宏星
Original assignee: 中广核工程有限公司; 中国广核集团有限公司
Priority date: 2015-04-22
Filing date: 2015-04-22
Publication date: 2016-10-27

Abstract

A power supply method and system for a hydrostatic test on a primary circuit (100) of a nuclear power plant. The method comprises: S1, an auxiliary power supply (21) supplies power in sequence via at least one column of inlet wire to start a main pump (241) on this column of inlet wire, and limits loads of a device, the device and the running main pump (241) being on the same column of inlet wire; S2, the auxiliary power supply (21) supplies power via the at least one column of inlet wire to start a charging pump (242) on this column of inlet wire; S3, the auxiliary power supply (21) supplies power to start a hydrostatic test pump (243) so as to pressurize a primary circuit (100) to a target pressure value; and S4, automatically start, if the auxiliary power supply (21) is de-energized in the above power supply steps, an emergency power supply (23) on one of columns of inlet wires to supply power to loads on this column of inlet wire. The method does not need a main power supply for use, and is high in safety and reliability.

Description

Description: A power supply method and system for primary circuit hydraulic test of nuclear power plant

[0001] The present invention relates to the field of nuclear power plant debugging, and in particular, to a power supply method and system for a primary circuit hydraulic pressure test of a nuclear power plant.

Background technique

[0002] The pressurized water reactor nuclear power plant is mainly composed of a pressurized water reactor, a primary loop system and a secondary loop system.

Nuclear fission is carried out in a reactor core consisting of nuclear fuel in a pressure vessel. The pressurized water reactor uses low enriched uranium as fuel and light water as coolant and moderator. The heat released by nuclear fission is carried out of the reactor by the high-pressure water flowing through the primary loop system in the reactor and transfers heat to the water in the secondary circuit in the steamer generator. The steam generated by the heating of the water drives the steam turbine, which drives the generator to generate electricity.

[0003] In order to prevent the leakage of radioactive materials, three barriers are set between the radioactive material (fission product) and the environment. As long as one of the barriers is intact, there will be no accident of radioactive material leakage. The primary pressure bearing boundary composed of the pressure vessel and its connected pipeline is the second barrier for the nuclear power plant to prevent the accidental release of radioactive products. In order to ensure the integrity of the second barrier, the hydrostatic test of the primary pressure bearing boundary must be carried out before charging, that is, the primary circuit hydraulic pressure test. Test 吋, the primary circuit is pressed to the target pressure value (for example, the first primary circuit hydraulic pressure test, which is 1.25 times the design pressure of the primary circuit, and the periodic retest is 1.2 times the design pressure of the primary circuit) to verify the primary circuit. Whether the pressure capacity of the pressure vessel and its connected pipeline meets the design requirements.

[0004] The primary circuit hydraulic test is an extra large, high-risk, difficult commissioning project for pressurized water reactor nuclear power plants.

In order to meet the requirements of the primary circuit hydraulic pressure test, the start of key equipment, and the joint commissioning of equipment, the first primary circuit hydraulic pressure test is required for the nuclear power plant. Two power supplies are available, that is, the main power supply and the auxiliary power supply are available or the main power supply and emergency Diesel engines are available to ensure emergency start-up of the charge pump; periodic retests require three power supplies to be available, ie mains, auxiliary power and emergency diesel are available.

[0005] The prior art requires that the primary power supply and periodic retesting of the nuclear power plant require that the primary power source be available. However, the construction of the main power line is often subject to external conditions, involving land acquisition, demolition, etc. It is very difficult to work. The main power supply is often still unavailable before the first-circuit hydrostatic test, which makes it impossible to carry out. The primary circuit hydraulic pressure test affects the commissioning process of the nuclear power plant.

technical problem

The technical problem to be solved by the embodiments of the present invention is to provide a power supply method and system for a primary circuit hydraulic pressure test in view of the above-mentioned drawbacks of the prior art.

Problem solution

Technical solution

[0007] In order to solve the above technical problem, an embodiment of the present invention provides a power supply method for a primary circuit water pressure test of a nuclear power plant, where the power supply method includes:

[0008] S1. The auxiliary power source sequentially supplies power to the main pump on the column line through at least one column of incoming lines, and performs load limitation on the load on the same column incoming line as the running main pump;

[0009] S2. The auxiliary power source starts the charging pump on the column line through the at least one column of incoming power;

[0010] S3. The auxiliary power supply starts the hydraulic test pump to pressurize the primary circuit to the target pressure value;

[0011] S4. If the auxiliary power source loses power in the above power supply step, the emergency power supply of one of the incoming lines is automatically activated to supply power to the load on the column.

[0012] Preferably, the auxiliary power source includes three rows A, B, and C for respectively supplying power to three main pumps for heating one circuit and circulating one circuit fluid, which are sequentially operated, wherein The pump is disposed on the A line of the auxiliary power source, the main pump No. 2 is disposed on the line B of the auxiliary power source, and the main pump No. 3 is disposed on the line C of the auxiliary power source; The pump includes a No. 1 charge pump connected to the emergency AC switchboard on the C-line and a No. 2 charge pump connected to the emergency AC switchboard on the B-in line, and the two charge pumps are used in one After the circuit hydraulic pressure test starts, the first circuit is filled with water, the water is injected into the shaft seal of the main pump, and the primary circuit is pressurized during the first-circuit hydrostatic test, and the balance is adjusted by the upper charge and the discharge. The pressure of the primary circuit; the hydraulic test pump is connected to the line B.

[0013] Preferably, in the step S4, the load comprises at least one of a hydraulic test pump, an upper charge pump, a device cooling water system, an important plant water system, a residual heat discharge system, an uninterruptible power supply, and a direct current power supply. .

[0014] Preferably, the power supply method further comprises: a main pump operation 吋, monitoring temperature of a tube plate of all steam generators of a circuit to determine whether the temperature of the entire circuit is uniform.

[0015] Preferably, the step S4 further comprises: setting a flow threshold for the discharge flow of the primary circuit to limit the discharge flow of the primary circuit. [0016] Preferably, the auxiliary power source further comprises a fourth column incoming line, wherein the A column incoming line is connected to the nuclear island unit distribution board LGM through the permanent factory switchboard LGB, thereby supplying power to the No. 1 main pump; The plant switchboard LGC is connected to the nuclear island unit switchboard LGN, which in turn supplies power to the No. 2 main pump; the C train entry line is connected to the nuclear island unit switchboard LGO through the permanent plant switchboard LGF, and then the No. 3 main pump is supplied; The wires are connected to the fourth column of power panels, which in turn power the plant's permanent loads and common accessory equipment.

[0017] Preferably, the emergency AC power distribution panel includes an emergency AC power distribution panel LHA, an emergency AC power distribution panel LHB, and an emergency AC power distribution panel LHC respectively disposed in the A, B, and C columns, respectively, for respectively mounting the nuclear island A. Column, column B and column C emergency load; each emergency AC switchboard is equipped with a diesel generator as emergency power source.

[0018] Preferably, the power supply method further comprises: detecting an outlet pressure of the upper charge pump or the hydraulic test pump, and if the outlet pressure continues to be lower than the pressure threshold within a predetermined time interval, closing the drain isolation valve and the upper charge Isolation valve.

[0019] Preferably, the power supply method further comprises: further closing the shaft seal control valve.

[0020] Preferably, the power supply method further comprises: further detecting an output voltage of the emergency AC switchboard LHB and the emergency AC switchboard LHC, if the output voltage of the emergency AC switchboard LHB or the emergency AC switchboard LHC is low, and is at a predetermined time The outlet pressure in the interval continues to be below the pressure threshold, and the upper charge isolation valve is closed.

[0021] Preferably, the power supply method further includes: further detecting an output voltage of the emergency AC power distribution panel LHB and the emergency AC power distribution panel LHC, if the output voltage of the emergency AC power distribution panel LHB or the emergency AC power distribution panel LHC is low, and is predetermined The outlet pressure is continuously below the pressure threshold, and the upper charge isolation valve and the shaft seal control valve are closed.

[0022] Preferably, among the three diesel engines, the B-column diesel engine has the highest availability priority.

[0023] Preferably, when the B-column diesel engine is not available and the C-column diesel engine is available, the power supply of the third emergency boronization pump in column C is used to supply the hydraulic test pump located in column B.

[0024] Preferably, when the B-column diesel engine is unavailable and the C-column diesel engine is available, a standby Linyi power supply is connected to the power distribution plate of the hydraulic test pump of column B, thereby supplying power to the hydraulic test pump of column B. Linyi power supply comes from the emergency power supply of column B.

[0025] Preferably, when the B-column diesel engine is unavailable and the C-column diesel engine is available, a standby Linyi power supply is connected to the power distribution plate of the hydraulic test pump of column B, thereby supplying power to the hydraulic test pump of column B. Alternate copy The electricity is a 380V diesel generator.

[0026] Preferably, the primary circuit hydraulic pressure test is periodically performed, and the diesel engines of the B and C trains are available at the same time, so that the power supply is not required.

[0027] Preferably, the second emergency boronization pump disposed in column B serves as a hydraulic pressure test pump.

[0028] Preferably, the power supply method further comprises: detecting current and temperature of each cable of the auxiliary transformer to the corresponding switchboard to determine whether the current and the temperature exceed a preset value.

Correspondingly, the present invention further provides a power supply system for a primary circuit hydrostatic test of a nuclear power plant, the power supply system comprising: an auxiliary power source that outputs power to the load through at least one column of incoming lines, at least one emergency power source, at least one a main pump for heating the primary circuit and the circulating primary circuit, at least one hydraulic test pump, and at least one upper charge pump; each of the emergency power supply, the main pump, the hydraulic test pump and the upper charge pump are electrically connected therein a column of incoming lines; wherein, the power supply system performs the following power supply methods:

[0030] S1. The auxiliary power source sequentially supplies power to the main pump on the in-line through at least one column of incoming lines, and performs load limitation on the load on the same column in line with the running main pump;

[0031] S2. The auxiliary power source starts the charging pump on the column line through the at least one column of incoming power;

[0032] S3. The auxiliary power supply starts the hydraulic test pump to pressurize the primary circuit to the target pressure value;

[0033] S4. If the auxiliary power source loses power in the above power supply step, the emergency power supply of one of the incoming lines is automatically activated to supply power to the load on the column.

[0034] Preferably, the auxiliary power source includes three rows A, B, and C for respectively supplying power to three main pumps for heating one circuit and circulating one circuit fluid in sequence, wherein The pump is disposed on the A line of the auxiliary power source, the main pump No. 2 is disposed on the line B of the auxiliary power source, and the main pump No. 3 is disposed on the line C of the auxiliary power source; The pump includes a No. 1 charge pump connected to the emergency AC switchboard on the C-line and a No. 2 charge pump connected to the emergency AC switchboard on the B-in line, and the two charge pumps are used in one After the circuit hydraulic pressure test starts, the first circuit is filled with water, the water is injected into the shaft seal of the main pump, and the primary circuit is pressurized during the first-circuit hydrostatic test, and the balance is adjusted by the upper charge and the discharge. The pressure of the primary circuit; the hydraulic test pump is connected to the line B.

[0035] Preferably, in the step S4, the load includes at least one of a hydraulic test pump, an upper charge pump, a device cooling water system, an important plant water system, a residual heat discharge system, an uninterruptible power supply, and a direct current power supply. .

[0036] Preferably, the power supply method further includes: a main pump operation 吋, monitoring all steam generators of a circuit The temperature of the tubesheet determines if the temperature of the entire loop is uniform.

[0037] Preferably, the step S4 further comprises: setting a flow threshold for the discharge flow of the primary circuit to limit the discharge flow of the primary circuit.

[0038] Preferably, the auxiliary power source further comprises a fourth column incoming line, wherein the A column incoming line is connected to the nuclear island unit switchboard LGM through the permanent factory switchboard LGB, thereby supplying power to the No. 1 main pump; The plant switchboard LGC is connected to the nuclear island unit switchboard LGN, which in turn supplies power to the No. 2 main pump; the C train entry line is connected to the nuclear island unit switchboard LGO through the permanent plant switchboard LGF, and then the No. 3 main pump is supplied; The wires are connected to the fourth column of power panels, which in turn power the plant's permanent loads and common accessory equipment.

[0039] Preferably, the emergency AC power distribution panel includes an emergency AC power distribution panel LHA, an emergency AC power distribution panel LHB, and an emergency AC power distribution panel LHC respectively disposed in the A, B, and C columns, respectively, for mounting the nuclear island A, respectively. Column, column B and column C emergency load; each emergency AC switchboard is equipped with a diesel generator as emergency power source.

[0040] Preferably, the power supply method further comprises: detecting an outlet pressure of the upper charge pump or the hydraulic test pump, and if the outlet pressure continues to be lower than the pressure threshold within a predetermined time interval, closing the drain isolation valve and the upper charge Isolation valve.

[0041] Preferably, the power supply method further comprises: further closing the shaft seal control valve.

[0042] Preferably, the power supply method further includes: further detecting an output voltage of the emergency AC switchboard LHB and the emergency AC switchboard LHC, if the output voltage of the emergency AC switchboard LHB or the emergency AC switchboard LHC is low, and is at a predetermined time The outlet pressure in the interval continues to be below the pressure threshold, and the upper charge isolation valve is closed.

[0043] Preferably, the power supply method further includes: further detecting an output voltage of the emergency AC switchboard LHB and the emergency AC switchboard LHC, if the output voltage of the emergency AC switchboard LHB or the emergency AC switchboard LHC is low, and is at a predetermined time The outlet pressure is continuously below the pressure threshold, and the upper charge isolation valve and the shaft seal control valve are closed.

[0044] Preferably, among the three diesel engines, the B-column diesel engine has the highest availability priority.

[0045] Preferably, when the B-column diesel engine is unavailable and the C-column diesel engine is available, the power supply of the third emergency boronization pump in column C is used to supply the hydraulic test pump located in column B.

[0046] Preferably, when the B-column diesel engine is unavailable and the C-column diesel engine is available, a standby Linyi power supply is connected to the power distribution plate of the hydraulic test pump of the B column, thereby supplying power to the hydraulic test pump of the B column. Linyi power supply Emergency power supply from column B.

[0047] Preferably, when the B-column diesel engine is unavailable and the C-column diesel engine is available, a standby Linyi power supply is connected to the power distribution plate of the hydraulic test pump of the B column, thereby supplying power to the hydraulic test pump of the B column. The standby Linyi power supply is a 380V diesel generator.

[0048] Preferably, the primary circuit hydraulic pressure test is periodically performed, and the diesel engines of the B and C trains are available at the same time, so that the power supply is not required.

[0049] Preferably, the second emergency boronization pump disposed in column B serves as a hydraulic pressure test pump.

[0050] Preferably, the power supply method further comprises: detecting current and temperature of each cable of the auxiliary transformer to the corresponding switchboard to determine whether the current and the temperature exceed a preset value.

Advantageous effects of the invention

Beneficial effect

[0051] Embodiments of the present invention have the following beneficial effects: The technical solution of the present application can also perform a primary circuit hydraulic pressure test after the main power source is unavailable, thereby enabling the first primary circuit hydraulic pressure test during the commissioning of the nuclear power plant and Periodic retesting is not subject to primary power. The technical solution of the present application also provides a series of safety measures for the emergency start of the auxiliary power supply after the emergency start of the upper charge pump and the failure of the start of the diesel engine, thereby improving the safety and reliability of the technical solution of the present application. Sex.

Brief description of the drawing

DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art description will be briefly described below, and obviously, in the following description The drawings are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

1 is a schematic diagram of a primary circuit hydraulic pressure test provided by the present invention;

2 is a flow chart of a power supply method provided by the present invention;

3 is a block diagram of a power supply system provided by the present invention;

4 is a schematic circuit diagram of the power supply system shown in FIG. 3;

[0057] FIG. 5 is a preferred block diagram of the load of the emergency power supply starting in FIG. 3;

6 is a circuit diagram of the fourth column of the power distribution panel of FIG. 4; 7A is a schematic diagram of power supply of a hydraulic pressure test pump according to a first embodiment of the present invention;

7B is a schematic diagram of power supply of a hydraulic pressure test pump according to a second embodiment of the present invention;

7C is a schematic diagram of power supply of a hydraulic pressure test pump according to a third embodiment of the present invention;

[0062] FIG. 8A is a schematic diagram of a power supply method for unsuccessful startup of a diesel engine according to an embodiment of the present invention;

8B is a schematic diagram of a power supply method for unsuccessful startup of a diesel engine according to another embodiment of the present invention.

Embodiments of the invention

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

[0065] FIG. 1 is a schematic diagram of a primary circuit hydraulic pressure test. 1 shows a main pump 1 1 , a steam generator 12 , a pressure regulator 13 and a pressure vessel 14 connected by a pipe 10 in a primary circuit 100, and a containment tank 15 for performing a primary circuit hydraulic pressure test, and charging The pump 16, the hydraulic test pump 17, the discharge isolation valve 181, the high pressure relief valve 182, the upper charge isolation valve 183, the shaft seal control valve 184, and the upper charge isolation valve 185. In the commissioning process of the nuclear power plant, in order to ensure the integrity of the pressure boundary of the primary circuit, the hydrostatic test of the primary pressure bearing boundary must be carried out before charging, that is, the primary circuit hydraulic pressure test. After the test, the primary circuit is boosted to the target pressure value (for example, 1.25 times the design voltage of the primary circuit) to verify whether the pressure capacity of the equipment and piping in the primary circuit 100 meets the design requirements.

[0066] As shown in FIG. 1 , a primary circuit hydraulic pressure test is performed. First, the upper charge pump 16 injects water into the primary circuit by means of the upper charge and the injection into the main pump shaft seal to increase the pressure of the primary circuit, and relies on the discharge. The way to discharge the water of the first circuit to reduce the pressure of the primary circuit, and then raise the pressure of the primary circuit to the outlet pressure of the upper charge pump 16, about 170 bar. The so-called charging means that the water in the volume control tank 15 is injected into the primary circuit 100 via the upper charging control valve 183 and the upper charging isolation valve 185 by the upper charging pump 16. The upper charging control valve 183 is used to adjust the upper charging flow, and the upper charging isolation valve 185 is used to open/close the upper charging channel. The injection into the main pump shaft seal means that the water in the volume control tank 15 is injected into the shaft seal of the main pump 11 via the shaft seal control valve 184 through the action of the upper charge pump 16 (the hydraulic test pump 17 in the next step). 111 in. The so-called venting means that the water of the primary circuit 100 is discharged into the volume control box 15 through the venting isolation valve 181 and the high pressure reducing valve 182. The lower isolation isolation valve 181 is used to open/close the lower leakage passage, and the high pressure relief valve 182 is used to adjust the discharge flow. [0067] Then, the upper charging isolation valve 185 is closed, the hydraulic pressure test pump 17 is activated, water is taken from the volume control box 15, and water is injected into the primary circuit 100 by injection into the main pump shaft seal to increase the primary circuit pressure.吋 The discharge flow rate is adjusted by discharging the high pressure relief valve 182, and then the primary circuit is boosted to the target pressure value.

[0068] In the other preferred embodiments provided by the present invention, the number of the venting channel and the upper charging channel can be adjusted according to actual needs, and the venting isolation valve 171, The number of the high pressure relief valve 182, the upper charge control valve 183, the shaft seal control valve 184, and the upper charge isolation valve 185 can also be adjusted according to actual needs.

[0069] The primary circuit hydraulic test is an extra large, high-risk, and difficult debugging project for the pressurized water reactor nuclear power unit.

In order to meet the requirements of the primary circuit hydraulic pressure test, the start of key equipment and the joint commissioning of equipment, the nuclear power plant is required to carry out the first primary circuit hydraulic pressure test. Two power supplies are available to ensure the emergency start of the upper charge pump. Refers to main power and auxiliary power or main power and emergency diesel; After periodic retesting, three power supplies are required, that is, main power, auxiliary power and emergency diesel are available. The technical problem to be solved in this application is how to use the auxiliary power supply and the emergency diesel engine for the primary circuit hydraulic pressure test without using the main power supply, and what measures are taken to ensure the safety performance is accepted.

[0070] Safe start of main pump, upper charge pump and hydraulic test pump

Referring to FIGS. 1-6, in the present application, after performing the primary circuit hydraulic pressure test, the power supply system shown in FIGS. 3 and 4 performs the power supply method of the primary circuit hydraulic pressure test of the nuclear power plant shown in FIG. 2. As shown in FIG. 2, the power supply method starts from step S1, that is, the auxiliary power source sequentially supplies power to the main pump on the column line through at least one column of incoming lines, and loads on the same column line as the main pump that is operated. Load limiting is performed to meet the auxiliary transformer capacity requirements on the listed line and the current requirements of the auxiliary transformers on the incoming line to the corresponding switchboard cables.

As shown in FIG. 3, the power supply system includes an auxiliary power source 21, an auxiliary transformer 22, and an emergency power source 23 that supply power to the load 24 through the three columns A, B, and C. The power supply system shown in Figure 3 shows three main pumps 241 connected to the eight, B and C column incoming lines, two upper charging pumps 242 connected to the B and C column incoming lines, and one connected to column B. The incoming hydraulic test pump 243 and the two emergency power supplies 23 for emergency power supply of the 8 and C columns respectively. It should be understood that in the present invention, the number of incoming lines of the auxiliary power source 21 and the number of the emergency power source 23, the main pump 2 41, the upper charge pump 242, and the hydraulic pressure test pump 243 are selectable. Similarly, the emergency power source 23, the main pump 241, the upper charge pump 242, and the hydraulic test pump 243 can be connected to any one of the columns according to actual needs. Line.

[0073] FIG. 4 shows a preferred embodiment of the power supply system shown in FIG. As shown in FIG. 4, in the preferred power supply system, the No. 1 main pump is disposed on the A line of the auxiliary power source, and the No. 2 main pump is disposed on the B line of the auxiliary power source, and the No. 3 main pump It is disposed on the C column of the auxiliary power supply. Therefore, in order to meet the auxiliary transformer capacity requirements and the current requirements of the auxiliary transformer to the corresponding switchboard cable, start the No. 1 main pump 吋, and the unneeded load listed in the A line is prohibited from being put into operation; Start the No. 2 main pump 吋, The load that is not required for the line B is prohibited from being put into operation. When the main pump No. 3 is started, the load that is not required for the line C is prohibited from being put into operation. In other words, no matter which main pump is started, the load must be limited.

[0074] Taking the No. 1 main pump as an example, the following loads on the A-line are prohibited from being put into operation: Condensate pump system (C EX) No. 1 pump, electric main feed pump system (APA) No. 1 pump, circulation Water System (CRF) No. 1 Pump, Condensate Purification System (ATE) No. 1 Pump, Conventional Island Closed Circuit Cooling Water System (SRI) No. 1 Pump, Boron Recovery System (TEP) No. 1, No. 3 Steam Compressor, Medium Pressure Safety Injection System (RIS) No. 1 pump, Auxiliary Water Supply System (ASG) No. 1 pump, containment heat removal system (EHR) No. 1 pump, additional cooling system (ECS) No. 1 circulation pump.

[0075] Following step S1 is step S2, that is, the auxiliary power source activates the charge pump on the train line through at least one column of incoming power. Preferably, as shown in FIG. 4, the upper charge pump includes a No. 1 upper charge pump connected to the emergency AC switchboard LHC on the C train line and an No. 2 charge on the emergency AC switchboard LHB connected to the B train line. Pump. Therefore, in step S2, the emergency AC switchboard LHC on the C-line is used to supply power to the No. 1 charge pump, and the emergency AC switchboard LHB on the B-line is used to supply the No. 2 charge pump. The two charging pumps are used to start the first-circuit hydrostatic test, fill the primary circuit with water, and simultaneously inject water into the shaft seal of the main pump, and pressurize the primary circuit during the first-circuit hydrostatic test. And balance the pressure of the primary circuit through the upper charge and discharge.

[0076] Immediately after the power supply method proceeds to step S3, the auxiliary power supply starts the hydraulic test pump to pressurize the primary circuit to the target pressure value. For the first primary circuit hydraulic test, the target pressure is usually 1.25 times the design pressure of the primary circuit. After periodic retesting, the target pressure is usually 1.2 times the design pressure of the primary circuit. Preferably, as shown in FIG. 4, the emergency boration pump 2 connected to the incoming line B in the present power supply system also serves as a hydraulic pressure test pump. Therefore, in step S3, the water pressure test pump powered by the B column is pressurized to the primary circuit to complete the final boost. Intrinsic equipment for emergency borated pump nuclear power plants, used to emergency reactor coolant system in nuclear power plants Into a boron-containing material, such as boric acid. The use of an emergency boronization pump as a hydrostatic test pump saves test costs and simplifies test equipment and wiring.

[0077] If the auxiliary power supply is de-energized in the power supply step, step S4 of the present power supply method is executed, that is, the emergency power supply of one of the in-line lines is automatically activated to supply power to the load on the in-line. As shown in FIG. 5, after the auxiliary power supply is de-energized, the emergency power supply 23 is powered to start the following load 24: the upper charge pump 242, the hydraulic test pump 243, the equipment cooling water system 244, the important plant water system 245, the residual heat discharge system 246, Uninterruptible power supply 247 and DC power supply 248. Among them, the hydrostatic test pump 243 and the residual heat removal system 246 are selectively actuatable. If the hydraulic test pump 243 or the residual heat exhaust system 246 is in an operating state before the auxiliary power supply is de-energized, the hydrostatic test pump 243 or the residual heat exhaust system 246 is activated by the emergency power supply 23 after the auxiliary power supply is de-energized, otherwise it is not activated. they. The equipment cooling water system 244 is used to provide cooling water to the equipment to be used during normal reactor operation and accident conditions. The system is an intercooling system. The important plant water system 2 45 functions to derive heat from the equipment cooling water system 244 and discharge it to the final heat sink, such as sea water. The residual heat removal system 246 is a system for cold shutdown stacking to remove residual heat from the core. The uninterruptible power supply 247 and the DC power supply 2 48 are power supplies for powering the nuclear power plant digital control system (DCS).

[0078] Through this step, after the auxiliary power supply is de-energized, it can ensure that the important equipment and system of the nuclear power plant will not cause uncontrollable safety problems due to power failure, thereby improving the safety and controllability of the power supply method. Preferably, as shown in FIG. 4, the emergency power source is the diesel engine LHR and LHQ. Of course, those skilled in the art can also select other available power sources as the emergency power source according to actual conditions.

[0079] Preferably, in order to prevent the pressure of the primary circuit from dropping after the auxiliary power supply is de-energized, a flow threshold is set in advance for the discharge flow of the primary circuit to limit the discharge flow of the primary circuit. When the auxiliary power supply is de-energized, the higher the discharge flow rate, the faster the voltage drop in the circuit and the greater the transient impact. As shown in Fig. 1, in order to reduce the transient shock, the discharge flow rate of the primary circuit 100 can be limited by setting the flow threshold of the high pressure reducing valve 182.

[0080] Through the power supply method of the embodiment, after the main power source is unavailable, the three main pumps and the two upper charge pumps can be activated by the auxiliary power source, thereby performing a primary circuit hydraulic pressure test, thereby enabling the nuclear power plant to debug the process. Not subject to the main power supply.

[0081] In a preferred embodiment provided by the present invention, the power supply method performed by the power supply system further includes: a main pump operation 吋, monitoring the temperature of the tube sheets of all the steam generators of the first circuit to determine whether the temperature of the entire primary circuit is Already even. In the power supply system shown in Figure 4, in theory, when a single main pump is running, other The loops of the two shut down main pumps still have sufficient reverse flow to allow the entire primary circuit fluid to circulate sufficiently to achieve a uniform temperature. After the actual primary circuit hydraulic pressure test, in order to ensure that the temperature of the entire primary circuit is uniform, it is necessary to monitor the temperature of the primary circuit. As shown in FIG. 1, the present application monitors the temperature of the tubesheet 121 of the steam generator 12 of the primary circuit 100 to determine if the temperature of the entire primary circuit 100 has been uniform. In the power supply system shown in Figure 4, the primary circuit includes three main pumps and three corresponding steam generators. Specifically, the method for temperature monitoring may be to attach at least one temperature sensor to the outer surface of each tube sheet to measure the temperature of the tube sheet, if the temperature difference of all the tube sheets is within a prescribed range, such as 2 to 5 ° C, Then the temperature of the entire circuit is considered to be uniform. Of course, in other preferred embodiments, prior art techniques can also be employed for temperature monitoring. This embodiment fully ensures the feasibility of running the main pump in sequence to perform the primary circuit hydraulic pressure test.

In another preferred embodiment provided by the present invention, the power supply method performed by the power supply system further includes: detecting current and temperature of each cable of the auxiliary transformer to the corresponding switchboard, and determining whether the current and the temperature exceed the pre- Set the value. If the preset value is exceeded, the main pump is stopped. As shown in Figure 4, the cable includes electrical connections from the auxiliary transformer to the switchboard LGB, LGF, LGC and the fourth row of switchboards.

[0083] As shown in FIG. 4, in the power supply system of the embodiment, the LGA, LGD, and LGE are the power distribution panels of the unit, and the auxiliary equipment and some peripheral equipments necessary for the normal operation of the unit are connected, and when the units are stopped, the power distribution boards are stopped. They have also been phased out.

[0084] LGM, LGN, LGO and LGP are nuclear island unit switchboards for powering large-scale electrical equipment such as nuclear island safety plants, reactor plants and nuclear auxiliary plants, and low-voltage 380V AC power is distributed downward. Among them, No. 1 main pump is powered by LGM, No. 2 main pump is powered by LGN, and No. 3 main pump is powered by LGO.

[0085] LGB, LGC and LGF are permanent industrial switchboards, which are connected with important auxiliary equipment. When the units are shut down, these switchboards still need to continue to operate to ensure that the units start and stop normally.

[0086] The three-stage medium voltage 10 kV emergency AC switchboards LHA, LHB, and LHC are respectively disposed on the auxiliary power supply, B and C columns. The LHA switchboard is equipped with the nuclear island A column emergency load, the LHB switchboard has the nuclear island B column emergency load, and the LHC switchboard has the nuclear island C column emergency load. Diesel engines LHP, LHR and LHQ are respectively installed on the emergency AC switchboards LHA, LHB and LHC as emergency power supply in the plant. Under normal circumstances, the three-stage emergency AC switchboard is powered by the main power supply or the auxiliary power supply, and the diesel engine is powered on in the event of an accident. As shown in Figure 4, the 10kV voltages of the emergency AC switchboards LHA, LHB, and LHC are converted into transformers 1, 2, and 3, respectively. The 380V voltage is supplied to the emergency boride pumps 1, 2 and 3 via the switchboards LLE, LLH and LLC, respectively. Preferably, the emergency boronization pump 2 also serves as a hydraulic pressure test pump. Of course, it is also possible to use the emergency boronization pump 1 or 3 as a hydraulic pressure test pump according to actual design requirements, or to add a separate pump as a hydraulic pressure test pump.

[0087] The unit switchboard, permanent plant switchboard and emergency AC switchboard are divided into three power supply series: A, B and C.

In the prior art, after performing the primary circuit hydraulic pressure test, the power supply to the fourth series of power plants and the fourth power distribution board of the power plant are generally supplied to the fourth power distribution line of the plant through the main switch station and the main transformer through the 500 kV power grid, and the auxiliary power supply or the diesel generator is used. The fourth power distribution panel includes a public power distribution panel, and the public power distribution panel is used to supply power to the public accessory equipment. In the present application, after the primary circuit hydraulic pressure test, the auxiliary power supply supplies power to the three series and the power plant sharing switchboard through the auxiliary transformer. As shown in Figure 4, the auxiliary power supply includes 4 independent incoming lines, wherein the A-line incoming line is connected to the nuclear island unit switchboard LGM through the permanent factory switchboard LGB, and then the No. 1 main pump is supplied; Use the switchboard LGC to connect to the nuclear island unit switchboard LGN, and then supply power to the No. 2 main pump; the C train entry line is connected to the nuclear island unit switchboard LGO through the permanent plant switchboard LGF, and then to the No. 3 main pump; Connect to the fourth row of power strips to power the plant's permanent load and common accessory equipment.

[0088] As shown in FIG. 6, the fourth row of power panels in FIG. 4 includes a permanent factory switchboard LGH connected to the fourth column of the auxiliary power source, a unit switchboard LGG connected to the main power inlet, and connected to the permanent factory. The nuclear island unit switchboard LGQ of the switchboard LG H, the first public switchboard 8LGIA connected to the permanent plant switchboard LGH and the second public switchboard 8LGIB connected to the first utility panel 8LGIA.

[0089] Emergency start of the upper charge pump

[0090] In the power supply method for the primary circuit hydraulic pressure test of the nuclear power plant provided by the present application, the safe start of the upper charge pump and the hydraulic test pump is powered by the auxiliary power source. If the auxiliary power supply loses power, the diesel engine is started up urgently and the upper charging pump is installed to ensure the injection of the main pump shaft seal to maintain the pressure of the primary circuit and ensure the safety of the equipment.

[0091] After the auxiliary power supply is de-energized, the diesel engine in one of the incoming lines is automatically activated to drive the upper charging pump, the equipment cooling water system, the important plant water system and the residual heat discharging system of the corresponding line, and the diesel engine is listed Uninterruptible power supply and DC power supply on the line. As shown in Fig. 4, the No. 1 upper charge pump is set on the C column entry line, and the No. 2 upper charge pump is set on the B line entry line. The upper charge pump is used to fill the primary circuit with water in the first-circuit hydrostatic test. During the first-circuit hydrostatic test, it is pressurized to the primary circuit, and the pressure of the primary circuit is balanced by the upper charge and discharge. Water is injected into the shaft seal of the main pump. Specifically, since the upper charge pump is not in column A, Therefore, the availability of LHP diesel engine LHP is not required. The B-class diesel engine has the highest availability priority. It can supply the No. 2 upper charge pump and the hydraulic test pump to ensure their emergency power supply. Among them, the hydraulic test pump is the emergency boronization pump 2 in FIG. If the diesel engine in column B is not available and the diesel engine in column C is available, measures should be taken to ensure that the hydrostatic test pump has two power supply to improve the reliability and safety of the test.

[0092] After the outlet pressure of the upper charge pump is exceeded, the hydraulic pressure test pump is used alone for boosting. After the auxiliary power supply is de-energized, the hydraulic test pump is required to start. As shown in Figure 4, the hydraulic test pump is powered by the B emergency power supply (ie diesel LHQ). When the LHQ of the B diesel engine is available, the emergency power supply of the hydraulic test pump can be guaranteed, so that the auxiliary power supply loses power and water pressure. The test pump can be started. When the L-engine diesel LHR is available, and the B-column diesel engine is not available, the hydraulic test pump is guaranteed to have two power supplies through temporary measures. There are three preferred options for ensuring that the water pressure test pump has two power supplies.

[0093] Preferred Embodiment 1, as shown in FIG. 7A, the power supply of the emergency boilification pump 3 of column C is used to supply the water pressure test pump located in column B, that is, the emergency boride pump 2 is supplied. Linyi connects the 380V switchboard LLC of the emergency boronization pump 3 in column C to the emergency boronization pump 2 in column B to supply power.

[0094] Preferably, as shown in FIG. 7B, the power distribution board LL H located in the column B hydraulic test pump, that is, the emergency boride pump 2 is connected to the standby Linyi power supply, and the standby Linyi power supply may be from the C column. 380V emergency power supply.

[0095] Preferred scheme 3, as shown in FIG. 7C, is provided to the water pressure test pump in column B, that is, the power distribution tray of the emergency boride pump 2 is connected to another standby Linyi power supply, and the standby Linyi power supply is a Linyi 380V. The diesel generator is used to ensure the emergency start of the hydraulic test pump.

[0096] Preferably, in order to prevent the pressure of the primary circuit from dropping instantaneously after the auxiliary power source is de-energized, a flow threshold is set in advance for the discharge flow of the primary circuit to limit the discharge flow of the primary circuit. When the auxiliary power supply is de-energized, the higher the discharge flow rate, the faster the voltage drop in the circuit and the greater the transient impact. As shown in Fig. 1, in order to reduce the transient shock, the discharge flow rate of the primary circuit 100 can be limited by setting the flow threshold of the high pressure reducing valve 182.

[0097] The first circuit of a new nuclear power plant requires a first hydraulic test. However, in-service nuclear power plants usually perform a primary circuit hydrostatic test every ten years. Periodically re-testing the primary circuit hydraulic pressure test, considering that there are more risk points in the in-service nuclear power plant, in the case of using the auxiliary power supply, the diesel engines L HQ and LHR in columns B and C are required to be available, so that the water pressure is not necessary. The test pump is used for power supply in Linyi.

[0098] The emergency starting scheme of the upper charging pump and the hydraulic pressure testing pump provided by the embodiment can ensure that there are always two power supply, and the reliability and safety of the power supply in the first circuit hydraulic pressure test are improved. [0099] Measures to lose auxiliary power and unsuccessful diesel engine startup

[0100] If the auxiliary power supply is suddenly lost during the primary circuit hydraulic pressure test, and the emergency start of the diesel engine is not successful, the emergency AC switchboards LHA, LHB and LHC will lose power, which will cause the primary circuit to lose the charge pump or water. The pressure source provided by the pressure test pump. Therefore, if no measures are taken, the pressure in the primary circuit will be lost and control, resulting in serious consequences. To this end, the power supply method provided by the present application provides further measures to prevent such consequences.

[0101] The power supply method performed by the power supply system provided by the present application further includes: detecting an outlet pressure of the upper charge pump or the hydraulic test pump, and automatically closing the drain isolation valve if the outlet pressure continues to be lower than the pressure threshold within a predetermined time interval And an upper isolation valve, and optionally automatically close the shaft seal control valve. If the outlet pressure of the upper charge pump or the hydraulic test pump is lower than the threshold, it means that the start of the charge pump or the hydraulic test pump is unsuccessful, that is, the auxiliary power supply is de-energized and the diesel engine is unsuccessful. Among them, the connection relationship between the upper charge pump, the hydraulic test pump, the lower isolation isolation valve, the upper charge isolation valve and the shaft seal control valve is as shown in Fig. 1. That is, as shown in FIG. 8A, if the outlet pressure of the upper charge pump or the hydraulic test pump is low within a predetermined turn-to-turn delay, the shut-off isolation valve and the upper charge isolation valve are automatically closed, and selectively automatically Close the shaft seal to control the feed. Of course, the user can also manually close the valve by displaying the outlet pressure value of the upper charge pump or the hydraulic test pump.

[0102] In another preferred embodiment provided by the present invention, the closing of the upper charging isolation valve and the shaft seal control valve also depends on the voltage value on the emergency AC switchboard LHB or LHC, thereby preventing the upper charging pump from being in the initial stage of water filling. In the case of starting, the upper isolation valve and the shaft seal control valve are mistakenly closed. As shown in FIG. 8B, if the voltage value of the emergency AC switchboard LHB or LHC is low, and if the outlet pressure of the charge pump or the hydraulic test pump continues to fall below the threshold in the predetermined day, the upper charge isolation valve is automatically closed and Selective automatic closing of the shaft seal to control feeding. The voltage value on the emergency AC distribution panel LHB or LHC is low, which directly proves that the auxiliary power supply is de-energized and the diesel engine fails to start. Therefore, by detecting the voltage value on the emergency AC switchboard LHB and LHC, the upper charge isolation valve and the shaft seal control valve can be effectively prevented from being accidentally closed.

[0103] Preferably, in order to prevent the pressure of the primary circuit from dropping instantaneously after the auxiliary power source is de-energized, a threshold value is set in advance for the discharge flow of the primary circuit to limit the discharge flow rate of the primary circuit. When the auxiliary power supply is de-energized, the larger the discharge flow rate, the faster the voltage drop of the primary circuit, and the greater the transient impact. As shown in Fig. 1, in order to reduce the transient shock, the discharge flow rate of the primary circuit 100 can be limited by setting the flow rate of the high pressure reducing valve 182.

[0104] The power supply method and system for implementing the primary circuit hydraulic pressure test of the nuclear power plant of the present embodiment, even if the peer loses the auxiliary The power supply of the power supply and the diesel engine, the power supply system of the present application can also make the primary circuit in a controlled state, thereby avoiding safety problems caused by sudden power failure or sudden re-power supply.

The above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and those skilled in the art can understand all or part of the process of implementing the above embodiments, and according to the present invention. The equivalent changes required are still within the scope of the invention.

Claims

Claim

[Claim 1] A power supply method for a primary circuit hydraulic pressure test of a nuclear power plant, characterized in that the power supply method includes:

51. The auxiliary power source sequentially supplies power to the main pump on the line by at least one column of incoming lines, and performs load limitation on the load on the same line as the main pump that is operated;

52. The auxiliary power source activates the charging pump on the column line through the at least one column of incoming power;

53. Auxiliary power supply starts the hydraulic test pump to pressurize the primary circuit to the target pressure value;

54. If the auxiliary power source loses power during the power supply step described above, the emergency power supply on one of the incoming lines is automatically activated to supply power to the load on the column.

[Claim 2] The power supply method for a primary circuit hydraulic pressure test of a nuclear power plant according to claim 1, wherein:

The auxiliary power source includes three rows A, B and C for respectively supplying power to three main pumps for heating one circuit and circulating one circuit fluid in sequence, wherein the main pump No. 1 is set in the auxiliary power source. A is listed on the line, the main pump No. 2 is set on the line B of the auxiliary power source, and the main pump No. 3 is set on the line C of the auxiliary power source;

The charging pump comprises a No. 1 charging pump connected to the emergency AC switchboard of the C-in line and a No. 2 charging pump connected to the emergency AC switchboard of the B-in line, the two charging pumps respectively It is used to start the first-circuit hydrostatic test, fill the primary circuit with water, inject water into the shaft seal of the main pump, and pressurize the primary circuit during the first-circuit hydrostatic test, and pass the charge Drain to balance the pressure of the primary circuit;

The hydraulic test pump is connected to the line B.

[Claim 3] The power supply method for the primary circuit hydraulic pressure test of the nuclear power plant according to claim 1, wherein in the step S4, the load includes a hydraulic pressure test pump, an upper charge pump, and equipment cooling water. At least one of a system, an important plant water system, a residual heat exhaust system, an uninterruptible power supply, and a direct current power source.

[Claim 4] The power supply method for a primary circuit hydraulic pressure test of a nuclear power plant according to claim 1, wherein the power supply method further comprises: a main pump operation 吋, monitoring a tube plate of all steam generators of the primary circuit The temperature determines whether the temperature of the entire primary circuit is already uniform. The power supply method for the primary circuit hydraulic pressure test of the nuclear power plant according to claim 1, wherein the step S4 further comprises: setting a flow threshold for the discharge flow of the primary circuit to limit the discharge of the primary circuit after the auxiliary power supply is de-energized. flow.

The power supply method for a primary circuit hydrostatic test of a nuclear power plant according to claim 2, wherein the auxiliary power supply further comprises a fourth column incoming line; wherein the A series incoming line is connected to the nuclear island unit switchboard through the permanent factory switchboard LGB LGM, and then power supply for No. 1 main pump; Line B is connected to the nuclear island unit switchboard LGN through the permanent plant switchboard LGC, and then to the No. 2 main pump; C train line is connected to the nuclear island through the permanent plant switchboard LGF The unit switchboard LGO, which in turn supplies power to the No. 3 main pump; the fourth line of incoming lines is connected to the fourth row of switchboards, which in turn power the plant's permanent loads and common auxiliary equipment.

The power supply method for a primary circuit hydraulic pressure test of a nuclear power plant according to claim 2, wherein the emergency AC power distribution panel comprises an emergency AC power distribution panel LHA, which is respectively arranged in the A, B, and C columns, and emergency communication The switchboard LHB and the emergency AC switchboard LHC are used to mount the nuclear islands A, B, and C emergency loads respectively; each emergency AC switchboard is equipped with a diesel generator as the emergency power source.

The power supply method for a primary circuit hydraulic pressure test of a nuclear power plant according to claim 7, wherein the power supply method further comprises: detecting an outlet pressure of the upper charge pump or the hydraulic test pump, if the predetermined pressure is within the predetermined time interval When the outlet pressure continues to fall below the pressure threshold, the drain isolation valve and the upper charge isolation valve are closed.

The power supply method for a primary circuit hydraulic pressure test of a nuclear power plant according to claim 8, wherein the power supply method further comprises: further closing the shaft seal control valve.

The power supply method for a primary circuit hydrostatic test of a nuclear power plant according to claim 8, wherein the power supply method further comprises: further detecting an output voltage of the emergency AC switchboard LHB and the emergency AC switchboard LHC, if the emergency AC switchboard The output voltage of the LHB or emergency AC switchboard LHC is low and the outlet pressure continues to be below the pressure threshold for a predetermined time interval, closing the upper charge isolation valve.

The power supply method for a primary circuit hydraulic pressure test of a nuclear power plant according to claim 9, characterized in that the output of the emergency AC switchboard LHB and the emergency AC switchboard LHC is further detected. Pressing, if the output voltage of the emergency AC switchboard LHB or the emergency AC switchboard LHC is low, and the outlet pressure continues to be lower than the pressure threshold within a predetermined time interval, the upper charge isolation valve and the shaft seal control valve are closed.

The power supply method for a primary circuit hydrostatic test of a nuclear power plant according to claim 7, characterized in that among the three diesel engines, the B-column diesel engine has the highest availability priority.

The power supply method for a primary circuit hydrostatic test of a nuclear power plant according to claim 12, wherein when the B-column diesel engine is unavailable and the C-column diesel engine is available, the power supply of the third emergency boronization pump of the C-column is used to be located at B. The column of the hydraulic test pump is powered by Linyi.

The power supply method for a primary circuit hydraulic pressure test of a nuclear power plant according to claim 12, characterized in that, when the diesel engine of the B column is unavailable and the diesel engine of the C column is available, the auxiliary power supply of the first phase is connected to the hydraulic test pump of the second column. The switchboard is used to supply the hydraulic test pump of column B. The road is supplied with emergency power from column B.

The power supply method for a primary circuit hydraulic pressure test of a nuclear power plant according to claim 12, characterized in that, when the diesel engine of the B column is unavailable and the diesel engine of the C column is available, the auxiliary power supply of the first phase is connected to the hydraulic test pump of the second column. The switchboard is used to supply the hydraulic test pump of column B. The standby power supply for the road is a 380V diesel generator.

The power supply method for a primary circuit hydraulic pressure test of a nuclear power plant according to claim 7, characterized in that, after the primary circuit hydraulic pressure test is periodically performed, the diesel engines of the B and C trains are available at the same time, thereby eliminating the need for power supply.

A method of supplying power to a primary circuit hydrostatic test of a nuclear power plant according to claim 2, wherein the second emergency boronization pump disposed in column B serves as a hydrostatic test pump.

The power supply method for a primary circuit hydrostatic test of a nuclear power plant according to claim 2, wherein the power supply method further comprises: detecting a current and a temperature of each cable of the auxiliary transformer to the corresponding switchboard to determine the current And if the temperature exceeds the preset value.

A power supply system for a primary circuit hydrostatic test of a nuclear power plant, characterized in that: the power supply system comprises: an auxiliary power supply for outputting power to the load through at least one column of incoming lines, at least one emergency power supply, at least one for heating the primary circuit and the circulation Main circuit of primary circuit fluid, at least one hydraulic test pump and at least one upper charge pump; each of said emergency power supply, main pump, hydraulic test The pump and the upper charging pump are respectively electrically connected to one of the in-line lines; wherein the power supply system performs the following power supply methods:

[Claim 20] The power supply system for a primary circuit hydrostatic test of a nuclear power plant according to claim 19, wherein:

The hydraulic test pump is connected to the line B.

[Claim 21] The power supply system for the primary circuit hydrostatic test of a nuclear power plant according to claim 19, wherein in the step S4, the load includes a hydraulic test pump, an upper charge pump, and equipment cooling water. At least one of a system, an important plant water system, a residual heat exhaust system, an uninterruptible power supply, and a direct current power source.

[Claim 22] The power supply system for a primary circuit hydraulic pressure test of a nuclear power plant according to claim 19, wherein the power supply method further comprises: a main pump operation 吋, monitoring a tube plate of all steam generators of the primary circuit The temperature determines whether the temperature of the entire primary circuit is already uniform.

[Claim 23] A power supply system for a primary circuit hydrostatic test of a nuclear power plant according to claim 19, characterized in that The step S4 further includes: setting a flow threshold for the discharge flow of the primary circuit to limit the discharge flow of the primary circuit.

The power supply system for a primary circuit hydrostatic test of a nuclear power plant according to claim 20, wherein the auxiliary power supply further comprises a fourth column incoming line; wherein the A series incoming line is connected to the nuclear island unit switchboard through the permanent factory switchboard LGB. LGM, and then power supply for No. 1 main pump; Line B is connected to the nuclear island unit switchboard LGN through the permanent plant switchboard LGC, and then to the No. 2 main pump; C train line is connected to the nuclear island through the permanent plant switchboard LGF The unit switchboard LGO, which in turn supplies power to the No. 3 main pump; the fourth line of incoming lines is connected to the fourth row of switchboards, which in turn power the plant's permanent loads and common auxiliary equipment.

The power supply system for a primary power circuit hydraulic test of a nuclear power plant according to claim 20, wherein the emergency AC power distribution panel comprises an emergency AC power distribution panel LHA, which is respectively arranged in the columns A, B, and C, and emergency communication The switchboard LHB and the emergency AC switchboard LHC are used to mount the nuclear islands A, B, and C emergency loads respectively; each emergency AC switchboard is equipped with a diesel generator as the emergency power source.

The power supply system for a primary circuit hydrostatic test of a nuclear power plant according to claim 25, wherein the power supply method further comprises: detecting an outlet pressure of the upper charge pump or the hydraulic test pump, if the When the outlet pressure continues to fall below the pressure threshold, the drain isolation valve and the upper charge isolation valve are closed.

The power supply system for a primary circuit hydrostatic test of a nuclear power plant according to claim 26, wherein the power supply method further comprises: further closing the shaft seal control valve.

The power supply system for a primary circuit hydrostatic test of a nuclear power plant according to claim 26, wherein the power supply method further comprises: further detecting an output voltage of the emergency AC switchboard LHB and the emergency AC switchboard LHC, if the emergency AC switchboard The output voltage of the LHB or emergency AC switchboard LHC is low, and the outlet pressure continues to be below the pressure threshold for a predetermined time interval, closing the upper charge isolation valve.

The power supply system for a primary circuit hydrostatic test of a nuclear power plant according to claim 27, wherein the power supply method further comprises: further detecting an output voltage of the emergency AC switchboard LHB and the emergency AC switchboard LHC, if the emergency AC switchboard LHB or emergency communication The output voltage of the electric panel LHC is low, and the outlet pressure continues to be lower than the pressure threshold within a predetermined time interval, and the upper charging isolation valve and the shaft seal control valve are closed.

A power supply system for a primary circuit hydrostatic test of a nuclear power plant according to claim 25, wherein among the three diesel engines, the B-stage diesel engine has the highest availability priority.

The power supply system for a primary power circuit hydraulic test of a nuclear power plant according to claim 30, wherein when the diesel engine of the B column is unavailable and the diesel engine of the C train is available, the power supply of the third emergency boronization pump of the C train is used for the B. The column of the hydraulic test pump is powered by Linyi.

The power supply system for a primary power circuit hydraulic test of a nuclear power plant according to claim 30, wherein when the diesel engine of the B column is unavailable and the diesel engine of the C column is available, the auxiliary power supply of the first line is connected to the hydraulic test pump of the second column. The switchboard is used to supply the hydraulic test pump of column B. The road is supplied with emergency power from column B.

The power supply system for a primary power circuit hydraulic test of a nuclear power plant according to claim 30, wherein when the diesel engine of the B column is unavailable and the diesel engine of the C column is available, the auxiliary power supply of the first line is connected to the hydraulic test pump of the second column. The switchboard is used to supply the hydraulic test pump of column B. The standby power supply for the road is a 380V diesel generator.

The power supply system for a primary circuit hydrostatic test of a nuclear power plant according to claim 25, characterized in that after the primary circuit hydraulic pressure test is periodically performed, the diesel engines of the B and C trains are available at the same time, thereby eliminating the need for the power supply.

A power supply system for a primary circuit hydrostatic test of a nuclear power plant according to claim 20, wherein the second emergency boronization pump disposed in column B serves as a hydrostatic test pump.

The power supply system for a primary circuit hydrostatic test of a nuclear power plant according to claim 20, wherein the power supply method further comprises: detecting a current and a temperature of each cable of the auxiliary transformer to the corresponding switchboard to determine the current And if the temperature exceeds the preset value.